How long can I use the course once I pay for it? Academy Support August 05, 2015 15:36 Follow For as long as you need it! Once you purchase a course in the GNS3 Academy, it is yours to keep. Related articles Where is the training on how to use GNS3? How do I remove my credit card from my account? Why can't I see my courses after I purchased them? Comments 0 comments Article is closed for comments.